FILE - This Oct. 18, 2011 file photo shows US Supreme Court justice Antonin Scalia addressing the Chicago-Kent College Law justice, in Chicago. Scalia is set to make appearances at a university law school, a church and a casino during a visit to Las Vegas on Sept. 5, 2012. (AP Photo/Charles Rex Arbogast, File)

The U.S. Supreme Court declined Monday to hear an appeal from a national group opposed to same-sex marriage that tried to thwart Maine's campaign disclosure law requiring it to release its donor list.

The high court turned aside an appeal from the National Organization for Marriage, a Washington, D.C.-based group that donated $1.9 million to a political action committee that helped repeal Maine's same-sex marriage law in 2009.

Maine's campaign disclosure law requires groups that raise or spend more than $5,000 to influence elections to register and disclose donors. The group contends that releasing the donor list would stymie free speech and subject donors to harassment, but the lower court refused to throw out the law.

Following Monday's decision, National Organization for Marriage Chairman John Eastman said his group will review Maine's requests to disclose certain donors in the 2009 campaign.

Voters repealed Maine's same-sex marriage law in 2009, but it's on the ballot again in the Nov. 6 election.

For now, the 2009 donor list remains under wraps while a separate National Organization for Marriage case makes its way through the state court system.

While the federal lawsuit has played out, the group is using state courts to challenge the state ethics commission's use of subpoenas in the case. A superior court justice upheld the subpoenas in state court over the summer, but the group has appealed that decision to the state Supreme Court.

Matt McTighe, campaign manager for Mainers United for Marriage, which supports the same-sex marriage proposal on the ballot, said same-sex marriage supporters don't care so much about who's on the group's list of donors but rather want the organization to play by the same rules as everybody else.

"If they're going to pour hundreds of thousands of dollars into the campaign like they did in 2009, the people of Maine should know where that money's coming from," he said.

The group announced this month it has given $250,000 to the campaign opposing Maine's same-sex marriage proposal. It has also registered a political action committee, the National Organization for Marriage Maine PAC, to oppose the referendum.